Geothermal Valley - Bacon! Achievement

There's a box of bottles near the campfire at the Ruins Encampment Base Camp. Grab one.

Then move through the gap in the wooden fence to the north.

Drop down into the grassy area below. The clearing where you killed the boars for the Hearty Meal Challenge is just ahead on the left.

Craft a molotov and throw it at one of the boars.

If you manage to kill it, you'll unlock the Bacon! Achievement. Simple and tasty—if not very humane. If there are no boars around, just try again the next time you find yourself in this area. They will eventually respawn.